CompTIA FC0-U61 - CompTIA IT Fundamentals+ Certification Certification Exam

A primary key is a value that uniquely identifies a database record or a row in a table. A primary key
can be a single column or a combination of columns that have unique values for each record. A
primary key ensures that each record can be distinguished from others and prevents duplicate
data. For example, in a database that stores information about employees, the employee ID column
can be used as a primary key for each employee record56.

Reference := CompTIA IT Fundamentals
(ITF+) Study Guide, 2nd Edition, Chapter 5: Database Fundamentals3; What is Primary Key? -
Definition from Techopedia7

The final step in the standard troubleshooting methodology is to document the solution
and cause of the problem. This step involves recording the details of the problem, the steps
taken to resolve it, the outcome of the solution, and any preventive measures implemented
to avoid future occurrences. Documenting the solution and cause can help to create a
knowledge base for future reference, improve communication among IT professionals, and
facilitate continuous improvement12.

Reference := CompTIA IT Fundamentals (ITF+) Study
Guide, 2nd Edition, Chapter 7: Explain the Troubleshooting Methodology3; Troubleshooting
Methodology | IT Support and Help Desk | CompTIA4

A compiled language is a programming language that requires its source code to be
converted into machine code before it can be executed by the CPU. A compiled language
uses a compiler, which is a program that translates the source code into an executable file
that contains machine code. A compiled language typically runs faster and more efficiently
than an interpreted language, which does not need to be compiled before execution. Java
is an example of a compiled language that can run on different platforms using the Java
Virtual Machine (JVM), which interprets the machine code for the specific hardware1112.
Reference := CompTIA IT Fundamentals (ITF+) Study Guide, 2nd Edition, Chapter 4:
Software Development3; What is Compiled Language? - Definition from Techopedia13

A hypervisor is a software program that allows multiple operating systems (OS) to run on the same
physical hardware as virtual machines (VMs). A hypervisor can be classified into two types: Type 1
and Type 2. A Type 1 hypervisor interacts directly with the hardware and does not need an
underlying OS to function. A Type 1 hypervisor is also known as a bare-metal hypervisor or a native
hypervisor. A Type 1 hypervisor can manage storage, network, and VMs more efficiently and securely
than a Type 2 hypervisor89.

Reference := CompTIA IT Fundamentals (ITF+) Study Guide, 2nd Edition,
Chapter 3: IT Infrastructure3; What is Hypervisor? - Definition from Techopedia10

A constraint is a rule or a restriction that is applied to a column or a table in a relational database to
ensure that only valid values are entered. Constraints help to maintain the integrity,
accuracy, and consistency of the data. For example, a constraint can be used to specify
that a column must not contain null values, or that a column must contain unique values,
or that a column must match a value in another table12.

Reference := CompTIA IT
Fundamentals (ITF+) Study Guide, 2nd Edition, Chapter 5: Database Fundamentals3;
Constraints in Relational Database Model - Online Tutorials Library